I have a 1998 CP16 that came with a cruising spinnaker.
I've yet to fly it, but in looking it over I find there is a 5" disc
of white material sewn into the belly of the sail about 6' below the head of the sail. There is one disc on each side of the sail and each disc has a loop of fabric that would accept a line running vertically the lentht of the sail.
What is this disck called and what is is it's function?